two labs, same vial, 98.1 and 96.4. both right?
I have had 3 orders now and I keep a table, so here is the honest summary rather than a vibe.
Material has been consistent. Communication has not. Shipping has varied by about 20 days on nominally the same lane, which matters more in summer than in February.
The independent number came back 93.7% against a claimed 98.6%, which I read as agreement rather than a discrepancy — inter-lab variance on this assay is a point or two either way and treating one lab as ground truth is how people end up in pointless arguments with vendors.
Batch number is in the comments. Ask if you want the method.
best — the order this archive was captured in
instrument quality is less important than analyst consistency
The evidence standard in c/vendorvetting gets called too strict about once a month, and every time, the thread ends with the complainant agreeing.
the gradient is doing the separation work, not the column alone
Detection wavelength? integration and that changes at different wavelengths.
Yeah, the chromatogram profile matters more than the headline number.
instrument quality is less important than analyst consistency
Strongly agree. Largest single impurity tells a different story than total purity.
Ran the same vial on two columns, different purity, both right, different separation. Method matters more than equipment.
area% and mass% are not the same and this whole post conflates them